1：Experimental Design and Method Selection

The study involved the fabrication of Al-based composites reinforced with TiB2 ceramics (1 wt.%, 2 wt.%, and 5 wt.%) using selective laser melting (SLM). The overall experimental design rationale was to investigate the influence of TiB2 ceramic fraction on the densification, microstructure, and mechanical properties of the composites.

2：Sample Selection and Data Sources

Near-spherical AlSi10Mg powder with a purity of 99.9% and TiB2 ceramic powder were used. AlSi10Mg composite powders containing 1 wt.%, 2 wt.%, and 5 wt.% TiB2 particles were mixed and homogenized using a Fritsch Pulverisette 6 planetary ball mill.

3：List of Experimental Equipment and Materials

SLM 150 device for manufacturing, Fritsch Pulverisette 6 planetary ball mill for mixing powders, SEM for microstructure characterization, EBSD for grain orientation and size distribution, HXS-1000AY Vickers indenter for microhardness measurements, CMT5205 machine for tensile tests.

4：Experimental Procedures and Operational Workflow

The SLM process was carried out under high-purity Ar atmosphere. The process variables included laser power of 450 W, hatch spacing of 50 μm, laser beam spot size of 70 μm, and scan speeds ranging from 1600 to 2600 mm/s. Cuboid composite samples were produced for microstructure analysis and tensile tests.

5：Data Analysis Methods

The experimental density was measured by Archimedes method. XRD analysis was performed to calculate lattice strain and dislocation density. Microstructure was characterized using OM and SEM. Microhardness and tensile properties were measured and analyzed.